The build quality is very good, however, achieved by the use of plastic materials is not the quality of a 24-70 or 17-55. There nothing wobbles, the lens hood snapped taut, and then sits firmly on the lens. Zoom and focus ring run soft and uniform. For friends of the manual focus, however the objective is to puzzle, because the focus ring to infinity turns in a very short distance from the closest distance and therefore a precise focus needed much tact.
In the optical quality are the two criticisms that rather strong distortion (especially for architecture or straight horizon depending on the focal length setting clearly visible) and vignetting. For analog phone users a no-go, for people, but the digitally reprocess negligible. Taking these points into account, you get for a lens that by its focal length range is very universal and very good sharpness provides. Lensflares by backlight it coped mostly good, in extreme situations, however, still flares in the picture may be visible. Contrast and color of the images give no cause for criticism.
Another big bonus point is the image stabilizer (VRII), which brings up to 4 stops advantage, thus making recordings with 1/15 sec possible at 120mm, a reasonably steady hand required. With 120mm aperture and 4 furthermore still a pretty good exemption of the subject is possible, it must be said that the quality of the uncertainty region is okay, but sometimes a bit hard edges occur in the highlights of the blur circles.
Bottom line, we can say that - as long as you can live with the compromises described - you get a very good lens that in this combination of image quality, aperture, focal length, and image stabilizer is unparalleled.
